Door closer valve



Filed Aug. 17. 1951 INVENTOR m A TTORNEY Patented Sept. 12, 1933 l noonoaosnn vAnvE Robert S. Potter, Old Greenwich, Conn., assignor to The Yale & Towne Manutjacturing Qompany, Stamford, Conn.

Application August 17, 193-1. sl ia nalss'mczs 4 Claims; n. isn) This invention relates to door checks of that type having means for controlling the movement of the door from 'a full-open position to a fully "closed position. Indoor checks of this type, "it

is customary to permit the door'to move rather swiftly-during the initial .closing movement, and then to change the door closing speedso as to obtain a desirable latching speed, inorder to control more effectively the slight noise incidental to the last final latching movement'of the door 3 to its closed position.

This problem: is a comparatively old one in the door closing art and was first aproached by L. C. Norton in Patent 1,152,339 granted August 31, .1915and ownedby The Yale & Towne Manufacturing Company. Norton devised a single adjusting screw which was adapted to adjust avalve controlling the movement of .the door through practically all of its closing movement to about 5. this screw having a second portion for ad- -justing a second valve to control the final moveclosing speedand an easily manipulated latching speed adjustment.

It is the object of this invention to devise an adjustment mechanism which will be adapted to control, first, the adjustment of the regular closing movement up to about 5%, and then without disturbing this firstadjustment substantially, to permit of a very fine and graduated adjustment of the latching speed. While the invention is a comparatively simple one, it solves a problem of long standing in the door closing art, and one which has been troublesometo the experts in that art.

Referring now to the drawingwhere a particular embodiment of my'invention is shown, Fig. 1 is a partially cut open view of a typical door closing arrangement, showing the application of my invention thereto. Fig. 2 is a. perspective view of a portion of the adjusting screw. Figs. 3, 4, and 5 are sections taken along the lines AA of Fig. 1 and showing my adjusting screw in its several positions.

As will be readily understood, reference causedby, its contact with the gear sector '5 cobe readily understood by those skilled in the art.

and 10. Theport' 9, in addition to the port "10 port 9 and the by-pass duct 8, will control the as to determinethe speed of the flow of fluid,

numeral 1 representsthe usual typeof cylinder having movable "therein a piston 2 equippedwith a piston 'head3, having the usual ball valve {I mounted therein. The movement of'the pistonis n .0, operating with the rack 6, the gear sector 5 being I 'mounted on theshaft 7 which is rotated upon opening and-closing niovement'of the-door as will A by-pass duct 8 connects the piston containing portion of the cylinder 1' with the body of the door closer, so asto permit the fluid to run from :the cylinder 1 intothe casing ofthe door closer to the rear of the piston when expelledv in that V direction by the movement of the piston as is readily' understood by those skilled in the art. This" movement of the piston against the fiuid'so as -to expel the fluid thro ugh the by-pass duct 8, V is controlled by the ducts and a pair of ports 9 will receive all the fluid duringthe major portion of the piston movement, and comprising 95% of the .door :closingimovement. The-movement of the piston. head '3 into the door closing position .will gradually cover entirely the port 9 .so that o ;port.10 will be the only port through which the closing movement. It is therefore, readily seen that adjustment ofthe-fiow of liquid through the liquid rlowi and the door closingspeed'during the major part of the door closing movement. It will be. readily seen that thecontrol of the port 10 will be efiective to regulate the final doorclosing or latching speed. 3 5 s V For the purpose of adjusting the various ports, I utilize an adjusting screw 11 having a screw threaded portion ;12 which cooperates with a threaded-bushing or insert 13 whichis adapted to hold in position the usual oilwasher 14 and the various other bearing means for the screw and valve. The adjusting screw 11 will then, through, its screw thread, 12, rotate relativelyto the bearing means, such rotation being. adapted to control the'position of portions of the screw Q Q9 for a purpose to be explained below.

The adjusting screw; 11. is equipped with a tapering portion .14 which will be adapted for adjusting the opening of the by-pass duct 8, so

ing each revolution of the screw ll. This will,

of course, make adjustment of the main closing movement of the door comparatively simple, and will permit of rather fine work.

a The adjusting screw 11 is further equipped with aportion 20 having a graduated groove 21 leading intothe lateral passage 22. (Fig. 2). As will be readily understood, any liquid flowing through the port 10 will be controlled by this groove 21." .In the position of. Fig. 3, it is obvious that the liquid will have to' flow through the port 10, and

the full length of the groove 21'and out through the passage 22, thus slowing up the latching,

movement considerably. In FigJi the latching movement will be considerably faster since the fluid will have a considerably" shorter pathway to traverse. In Fig. 5, the latching speed will be very considerable since the 'lluidwill have direct access to the duct 8 or port 9 through the port 10 and the passageway122. j The groove 21, as will .be'; readilyobserved, is

located onabout 180 of the peripheral circumference of. the adjusting screw 11, and is in the same plane as the port. This permits of a very slow and-graduated; adjustment of the latching speed, while at the same time,the main closing 'speed'controlled by the portion 14 of the screw,

- for, the purpose.

,is maintained comparatively constant due to the small amount of movement longitudinally of the screw ll'during 180 of rotation By this construction, Iam thus able to obtain .a very-effective meansrof simultaneously adjusting: the main closing movement and the latching spfi d, utilizing the single. screw of the prior art. While I have shown one modi-: fication' of my invention anda particular graduated groove, it should be understood that modifications of thesame within thescopejof the appended claims will readily occur to those skilled inthe art. 5

I claim: 1'; In a door check, the combination with a cylinderhaving a pairof valve ports leading to the cylinder chamber near oneend thereof, of a single regulating screw having screw threaded engagement with said cylinder and having a por tion cooperating with oneof said ports for ad justing the size thereof during a series of revolutions of said screw,.and having 'a second portion cooperating with the other of said ports for i g, 1,926,559 ing portion of the screw 14 will be obtained durscrew threaded engagement with said cylinder and having a portion cooperating with one of said 'ports'for continuously adjusting the size thereof by a gradual rotation and movement of the screw relativelyto theeylinder, andhaving asecond portion cooperating with the other'of said ports for adjusting the size. thereof from minimu'm'to maximum during substantially 180 rotation of said screw.

3. In a door check, a cylinder having a pair of valve ports leading to the cylinder near one end thereof, a-single ,valve regulating screw having screw threaded engagement with said cylinder and having a portion cooperating with one of said ports for continuously adjusting the size thereof by a' gradual rotation and movement of the. screw relativelyto the cylinder, and having a second portion cooperating with the other of said-ports. for adjusting the size thereof from minimum to, maximum during a substantial ro-" tation of saidserew less than; 360", said portion embodying a circumferential graduated groove on theperiphery ofsaid screw.

ing screw threaded engagement with said-cylinderand having a portion cooperating with one .of said ports for continuously adjusting the size thereof by a gradual rotation and movement of the screw relatively to theflcylinder, and having [4. In adoor check, a cylinder having a pair of yalve ports leading to the cylinder near one end thereof, a single valve regulating screw hava second portion cooperating with the other of 7 said" ports for adjustingrthe size thereof from minimum to. maximum during a substantial rotation of said screw; said portion embodying a circumferential groove of varying depth and occupying substantially 130 of the screw circumference, and communicating at its deepest point with a longitudinal escape groove on the screw surface. ROBERT S. POTTER. 

